Aaron Wolf's released a jim-dandy Barbershop Quartet arrangement of Nina Paley's song "Copying is Not Theft."
The song is licensed Creative Commons Attribution Share-Alike 3.0 (as is my entire website). This means I have full legal right to do anything I want with it as long as I credit Nina and I license my version the same way. Lots of people have already made tons of variations of the song from jazz to punk rock versions.
Read more in Music at Boing Boing
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.